A man armed with knives was today arrested near the UK Parliament on suspicion of planning a terror attack. Scotland Yard said the suspect was carrying a rucksack containing knives when he was detained following a stop and search as part of an ongoing operation. <br/><br/><br/>Whitehall, the political heart of London which houses the Downing Street and other government buildings culminating in Parliament Square, and Parliament Street were closed to traffic as Metropolitan Police officers and forensics officers continued their investigation.<br/>'<br/><br/>The Metropolitan Police confirmed that the man in his 20s has been arrested under the UK's Terrorism Act and is being questioned at a south London police station.''<br/><br/>According to reports, the arrest was the result of an ongoing anti-terrorism operation and that the arrested man was on the radar of intelligence officers.'<br/><br/>Westminster area of London remains on high alert since the terror attack on Parliament on March 22, which claimed five lives including terror suspect Khalid Masood.<br/>'<br/>''''''' <br/>